Thread: safety question on e85 modding

Hey guys just another opinion here besides mine, I'm looking at dropping pulley again and installing 1.9s for now before I take time out of my busy schedule to throw my stage 3 p&p heads on.

Currently I'm running an l67 block with SD headers and a gen v with a 3.5mps and e85@20* timing no kr which so ever wideband AFR at 11.2

Thinking of a 3.3 with 1.9s on 18* timing any suggestions here or opinions before I make the move.

On a gen 3 top swap I ran the same setup with a 3.2mps with a gen 3 pushing 20* so I'm curious as the gen v equation would be considered a 3.1mps if it was a gen 3.

Thanks

I already like you. Like most people, they try to run the smallest pulley they can with minimal timing, you seem to be opposite with a larger pulley and higher timing. Timing > Boost.

I run a 3.4 on my Gen V (Mods in my sig), at 16* of timing without e85. I bet you could easily run a 3.3" on a Gen V with close to 20* of timing still. E85 is wonderful stuff.

Start with your 3.3", set your timing at like 17* and go for a spin. No KR, increase timing 1* until you either see KR or get above 20*. If your still KR free after 20* timing on a 3.3, well, I'd invest in a 3.2" and start again.

You are going to gain more at your level by pulling back timing and using a smaller pulley.

Dude just run both. A bunch of timing and a tiny pulley. It's e85. I'm at a 3.0 with 21* timing. Granted I have an s1x, but I'm sure you could get close to that as I'm sure I could go down more if I wanted. Why choose?

Do both.

Both... if E85 can handle an XP cam and 20 PSI of boost on my end itll take what you toss at it

I ran 20 degreees on a gen V with 3.0 and XP cam while on e85.

Yeah just do it via ifr table. I did it by just switching injectors to 42# in the beginning. always ran slightly lean and got a little knock. Now tuned properly. A bunch of timing, small pulley and no knock. Ifr table for the win.

Quick clarification: I set my ifr to what it's suppose to be at and then I set each cylinders skew rate to 133. Either way works, either inflating the injectors 30 some odd percent over where they're rated or just adjusting the skew. I prefer skew so my dic show my 13mpg accurately...

All these questions have been answered by frosty in a great writeup he did in the tuning section btw.

I have a nice thread in my signature for tuning e85. Personally I found Boost > Timing. Also with E85 try to run richer if possible. E85 doesnt make the engine bog down from overfuel until your well below the 10:1 range (Gas calibrated wideband) Personally I shoot for 10.8. The cooling effect from the added alcohol is HUGE.

Originally Posted by chrsmi1

Quick clarification: I set my ifr to what it's suppose to be at and then I set each cylinders skew rate to 133. Either way works, either inflating the injectors 30 some odd percent over where they're rated or just adjusting the skew. I prefer skew so my dic show my 13mpg accurately...

All these questions have been answered by frosty in a great writeup he did in the tuning section btw.

Frostys skew was changed to 1.22 for summer e85 or (122% in dhp i think). Is 133% the way to go? Just wondering which is correct? I would like to see my DIC working somewhat still so I have a close estimate on where to go find some e85..lol